Finding the Third Proportional to 406,732 and 618,390

Step by Step Solution

1. Step 1: Write the proportion equation
   406,732 : 618,390 = 618,390 : x
2. Step 2: Convert to fraction form
   406,732/618,390 = 618,390/x
3. Step 3: Cross multiply
   406,732x = 618,390 × 618,390
4. Step 4: Simplify right side
   406,732x = 382,406,192,100
5. Step 5: Solve for x
   x = 382,406,192,100/406,732
6. Step 6: Final answer
   x = 940,192.05